Engine Room: I did most of modelling these last year/ early this year and have not gone back to check your measurements against what I used, the 3D printed one I made 2-3 months ago fitted alright (the holes usually print undersize due to shrinkage). I'll go back and check this later. The last few months have been hectic to say the least.

Matt: If no one else jumps in lets just do a trans-pacific collaboration, it'll be a bit slower and more expensive but no reason it can't work.

Theo: The flange changes by head oval or round port and the position of the studs. I think there's a write up in the tech wiki, I don't remember off the top of my head. I have a H89 head on my engine, I could probably do the others once I know that this one works.